Riveting-machine.



0. W. MEADOWGROPT, sn.

. BIVBTING MACHINE.

APPLICATION FILED JAN. 22, 1912. 1 ,034,480', Patented Aug. 6, 1912.

2 SHEETS-SHEET 1.

amante@ 'Y /o/ Igf /aa 99 @d/ras; Meadow/arg r @2RM/mman cclLUMBxA PLANOGRAPH co..WASHlNaToN. D. c.

C. W. MBADOWGROFT, SB. RIVETING MACHINE.

APPLICATION FILED 11111.22, 1912.

1,034,480. Patented Aug. 6,1912.

2 SHEETS-SHEET 2..

/ WEN lllllll! nnulllmllmlll H i @l vof CHARLES W. MEADOWCROFT, SR., OF PHILADELPHIA, PENNSYLVANIA.

RIVETI NG-IVIACHIN E.

Specification of Letters Patent.

Patented Aug. 6, 1912.

Application filed January 22, 1912. Serial No. 672,548.

To all whom -it may concern:

Be it known that I, CHARLES W. MEADOW- cRorT, Sr., a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful Improvements in Riveting-Machines, of which the following is a specification. My invention relates to improvements in riveting machines, the object of the invention being to provide a rotary element carrying a circular series of balls adapt-ed t0 impart a rapid succession of blows to a hammer, and preferably through the medium of a ball interposed between the hammer and the balls of the rotary element.

A further object is tq provide a cont-inuously revolving rotary element containing a circular series of pockets in which balls are loosely mounted, and project beyond the periphery of the rotary element, said balls adapted to engage a ball supported in a pivoted arm and located against the upper end of a hammer, when said last-men` tioned ball Vand arm are elevated by the action of suitable mechanism pressing a rivet against the lower end of the hammer, and provide mechanism for imparting a rotary motion to the hammer simultaneously with its reciprocating movement imparted by the balls.

A further object is to provide an improved rivet carrying disk or table and mechanism controlling the movement o-f the table, whereby the table is revolved and momentarily stopped and locked in a position to present a rivet between the hammer above referred to and a vertically movable anvil, t-he movement of the latter being automatically controlled and timed in accordance with the movement of the table.

A further object is to provide improved means for elevating the anvil, and improved means for engaging and holding the rivet in position to receive the blows of the hammer, said holding means comprising a springpressed sleeve located within a nose adjust` ably iixed in the structure, and with relation to which the hammer is adjustable to compensate for wear.

l/Vitli these and other objects in view, the invention consists in certain novel features construction and combinations and arrangements of parts, as will be more fully hereinafter described and claims.

In the accompanying drawings: Figure 1, is a view in side elevation illustrating my improvements. Fig. 2, is a view in vertical longitudinal section through the center of the hammer operating structure. Fig. 3, is a view in section on the line 3 3 of Fig. 2. Fig. 4, is a view in front elevation illustrating the rivet carrying disk or table and its operating mechanism. Fig. 5, is a view in section on the line 5-5 of Fig. 2. Fig. 6, is a view in section on the line 6-6 of Fig. 2. Fig. 7, is a detail sectional plan view illustrating the mechanical movement which controls the operation of the disk or table, and Fig. 8, is a detailview illustrating the modiiication.

1, represents a support to which a bar 2 is secured by bolts 3, and nuts 4, and on this bar 2, a bracket 5 is secured by bolts 6. To the upper end of this bracket 5, the casing 7 of my improved hammer operating mechanism is secured by screws 8, and this casing illustrated more clearly in Figs. 2 and 3, is of general cylindrical form throughout its upper portion, andsomewhat rectangular at its lower portion, having a removable plate 9 at one side secured in place by screws 10.

The casing head 11 which is located parallel with the plate 9, is provided with `a central opening 12 alining with a central opening 13 in plate 9, and in these openings 12 and 13, bearings 14 and 15 respectively are secured by means of screws 16, which extend through the head and plate respectively, and are screwed into annular flanges 17 o-n the inner ends of the bearings.

A shaft 18 is mounted to turn in the bearings 14 and 15, and is provided with an annular enlargement 19 located in a circular recess in the bearing 14, and limiting the movement of the shaft in this direction. On the shaft 18, within the casing, my improved rotary element 20 is secured. This rotary element comprises two circular relatively thick disks secured together by rivets 21. Both of these disks have central openings one of which is screw-threaded to engage screw-threads 22 on shaft 18, and securely lock the rotary element to the shaft, and compel it to revolve therewith. This rotary element is made with an annular groove 23 into which a circular series of pointed out in the balls 24 project. These balls are mounted in circular, sockets 25 in the rotary element, and such sockets are formed by recessing the two members as clearly shown. The circular recesses 25 are greater than half of a circle, so that t-he outward movement of the balls are limited, yet the balls are loosely mounted to allow them free rotary motion as well as'inward and outward motion as will more fully hereinafter appear. These balls, as the rotary element is revolved., are adapted to engage a ball 26 in al pivoted arm 27, when the said ball is elevated above its normal position. r1`he ball 26 rests upon the upper end of a hammer 28, and is loosely confined within a recess in the arm 27 .j

Arm 27 is also compo-sed of two members secured together by rivets 29, and said arm at one end, is made with laterally projecting trunnions 30 projecting` through bearings 31 in head 11 and plate 9.

An oil cup 32 is preferably provided on the upper end of the casing, and has a wick 33 projecting into the casing and adapted to bel engaged by the balls 24, and to lubricate all of the parts of the hammer operating mechanism. Y j Y The lower end of the casing 7 is made with an opening 34, which opening is normally closed by a plate 35. is secured to the casing by means of a screw 36, the lat-ter opera-ting as a hinge pin to allow the plate to be swung to one side whenever desired. This plate 35 is locked in closed position by a thumb screw 37, and is provided with a circular barrel 39 through which the hammer 28 projects.

In the circular barrel 39, a gear wheel 40 located, and is in mesh with an idler 41 supported upon a journal 42 riveted into plate 35, and held in place by means of a nut 43 and washer 44. One side of the barrel is cut out to permit the gear 40 to mesh with the idler 41, and the latter normally meshes with a pinion 45 fixed to a shaft 46 supported in bearings 47 on the head 11. his shaft 46 is connected by miter gears 48 with shaft 18, and the latter is driven by a pulley 49 connected with any suitable source of power (not shown).

The hammer 28 above referred to is rectangular in form, and projects through an opening of similar shape in gear 40, so that while the hammer is permitted to reciprocate in the gear, the gear and the hammer are keyed to turn together.

A spacing washer 50 is located in the barrel 39, and holds the gear in the lower portion of the barrel, and said gear has a circular extension 51 which operates as a journal to center the gear and maintain it in proper relation to the other parts of the mechanism.

Thelbarrel 39 is made with a depending lug 52, which project-s into a recess 53 in a Ypossibility of Y rotary movement.

This plate 35A collar 54, and holds the collar against any A,This collar 54 and the lower restricted end of the barrel 39 are screw-threaded for the reception of a nose piece 55, and the latter is securely clamped after adjustment by means of a screw 56, located in the split end of the collar, as clearly shown in Fig. 6. This nose is Vof two internal Aliameters separated by an annular internal flange 57. T he hammer V28', while angular throughout its upper poris cylindrical throughout its lower portion v 7 I tion, and hence at the juncture of the angular and cylindrical portions, a shoulder is formed which normally bears upon a series of washers 58, which may be, removed o-neV at a time as the hammer wears. 1n the lower smaller internal d iameter of the nose,

a sleeve 59 is positioned around the hammer, and is pressed downwardly by means of a coiled spring 60, anda set screw 61 pro! jects through a slot in they nose, and against said sleeve 59 to limit the movement of the sleeve. This sleeve operates to hold the rivet when the hammer is pressed upwardly, and prevent any displacement of the rivet during the initial operation.

To the bar 2, at one end, 'parallel plates 61 are securedby bolts 62, and support at their outer ends, a transversely positioned shaft 63. On this shaft 63, a gear wheel 64 is secured, and meshes with a pinion 65 on a stub 66 secured in one of the side plates 61. On this stub 66, a relatively large pulley 67 is secured, and is connected by a strap 68 with a relatively small pulley 69 on shaft 18, so that `motion is transmitted to shaft 66 at a very reduced speed over the motion of shaft 18. rlhe plates 61, at top an'd bottom, are provided. with perforated ears 70 to which transverse bars 71 are s-ecured by screws 72. yThese transverse bars have bearings 73 for a vertical shaft 74 on the upper end of which a rivet carrying disk or table 75 is mounted. The shaft 63 has fixed thereon, a sleeve 76, and on this sleeve an integral segmental worm 77 and a segmental annular key 78 are provided. A bar 102 is secured to shaft 74, and has upwardly projecting pins 103 which project through openings in plate 75, and compel the plate to turn with the shaft, yet allow it vertical movement. This segmental worin and key engage between the teeth of a worm wheel 79, fixed to shaft 74. The teeth of this worin wheel 79 are alternately beveled and straight, the beveled teeth engaged by the segmental worm 77, and the straight teeth by the key 78. More correctly speaking, the teeth are so shaped that they are beveled at one side, and straight at their other side, so that the recesses betweenv the teeth are alternately inclined and straight, the segmental cam engaging in the beveled recesses,

serves to move the wheel 79, and shaft 74v a distance Vequal to the length of two teeth, and as the segmental worm rides 4out from between the teeth, the key 78 enters the straight recess and locks the shaft against possibility of movement. By this mechanism, an intermittent rotary feed is transmitted to the shaft 74, and disk or table 75, and the length of this movement is just such as to move the table so as to present one rivet after another in position below the hammer, and momentarily hold the table in this positionby reason of the movement of the key between the teeth of the worm wheel..

On shaft 63, cams 8O are secured and engage rollers 81 in the bifurcated ends of levers 82. These levers are fulcrumed between their ends on a transverse shaft 83 mounted in the plates 61, and at their opposite ends are connected by a transverse bar 84, and engage under a bracket 85. The bracket 85, at its upper portion, has a clamping plate 86 which secures it around a hollow spindle 87. In this hollow spindle 87, an anvil 88 is mounted, and its downward movement is limited by a fixed screw 89 in `a bracket 90 secured tothe plates 61. The bracket 85 is also provided with parallel threaded rods 91, on which an arm 92 is held by nuts 93, and engages under the lower end of the spindle 87, thereby relieving the clamping plate 86 of the entire duty of connecting the bracket and the spindle.

A bar 94 is secured to the levers 82 by means of bolts 95, and this bar is provided with an opening 96 in its free end for the attachment of any suitable manually operating means (not. shown), so that the mechanism may be operated manually as well as automatically.

An oil cup 97 is preferably provided to lubricate shaft 18, and is secured to the bearing 15.

Instead of employing the ball 26 as illustrated in Fig. 2, I might employ a block 98 which is fixed against vertical movement in an arm 99 by means of a rivet 100. The upper end of this block 98 is beveled as shown at 101, and this beveled end is adapted to be engaged by the balls 24, while the lower end of the block engages the hammer 28.

In operation, the rivet, and if desired the work, is supported on the table or disk 7 5, and as this disk or table is moved step by step through the action of the segmental worm 77, key 78, and worm wheel 79 to present the rivet in position between the anvil 88 and the hammer 28, cams 80 operate to move levers 82 and elevate the spindle 87N and anvil 88. This movement exerts an upward pressure on the hammer, the rivet being steadied by means of the springpressed sleeve 59. As the hammer is moved upwardly, it causes the arm 27 to pivot, and

the ball 26 to move into the path of balls 24. The rapid centrifugal action of the rotary element 2O causes these balls 24 to impart blows to ball 26, and the force of these blows are regulated by the upward pressure on the hammer as will be readily understood. The rotary element is revolving rapidly, and while the key 78 holds the table securely locked against movement, for but a relatively short period, during such period a great number of blows' are struck by the balls, and the rivet is completely upset. This timing of the stop, and the number of blows struck can be controlled absolutely by the speed of the mechanism, and the desired results obtained.

By providing balls, they continually present new surfaces for contact. In other words, the engagement of balls 24 with ball 26 causes the balls to revolve and they do not wear at any one point, but the wear is evenly distributed throughout the circumference. When any of the balls wear, they can be readily replaced, and they are of course made of the hardest possible steel to withstand the necessary wear to which they are subjected. The parts are so constructed and assembled that access may be readily had to the interior of the casing for purposes of examination and repair, and the device may be kept perfectly clean and lubricated so as to produce the best possible results.

Various slight changes might be made in the general form and arrangement of parts described without departing from my invention and hence I do not limit myself to the precise details set forth, but consider myself at liberty to make such changes and alterations as fairly fall within the spirit and scope of the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A riveting machine, comprising a hammer, a circular rotary element having an annular series of curved recesses therein, and balls located within the recesses and adapted to impart movement to the hammer, substantially as described.

2. A riveting machine, comprising a hamnier, aV circular rotary element having an annular series of curved recesses therein, balls located within the recesses and adapted to impart movement to the hammer, said rotary element having an annular groove in its periphery into which the balls project, substantially as described.

3. A riveting machine, comprising a hammer, a circular rotary element having an annular series of curved recesses therein, balls located wit-hin the recesses and adapted to impart movement to the hammer, said rotary element having an annular groove in its periphery into which the balls project,

in the nose and projecting beyond the end thereof, substantially as described.

14. A riveting machine, comprising a hammer, means for reciprocating the hammer, an anvil below the hammer, a rivet supporting disk or table located between the ha1nmer and the anvil, a worm wheel secured to turn with the disk or table and having teeth beveled at one side and straight on their other sides, whereby an alternate series of inclined and straight walled recesses are formed between the teeth, a segmental worm engaging the beveled faces of the teeth, and an annularly positioned key engaging the straight faces of the teeth, whereby an intermittent movement is imparted to the table, and said table locked while at rest, substantially as described.

15. A riveting machine, comprising a hammer, means for reciprocating the hammer, an anvil below the hammer, a rivet supporting disk or table located between the hammer and the anvil, a worm wheel secured to turn with the disk or table and having teeth beveled at one side and straighton their other sides, whereby an alternate series of inclined and straight walled recesses are formed between the teeth, a segmental worm engaging the beveled faces of the teeth, an annularly positioned key engaging the straight faces of the teeth, whereby an intermittent movement is imparted to the table, and said table locked while at rest, a sleeve with which said segmental cam and key are integral, a shaft to which said sleeve is iiXed, and transmitting mechanism connecting the rotary element and the said last-mentioned shaft, substantially as described.

16. A riveting machine, comprising a hammer, means for reciprocating the hammer, an anvil below the hammer, a rivet supporting disk or table located between the hammer and the anvil, a worm wheel secured to turn with the disk or table and having teeth beveled at one side and straight on their other sides, whereby an alternate series of inclined and straight walled recesses are formed between the teeth, a segmental worm engaging the beveled faces of the teeth, an annularly positioned key engaging the straight faces of the teeth, whereby an intermittent movement is imparted to the table, and said table locked while at rest, a sleeve with which said segmental cam and key are integral, a shaft to which said sleeve is fixed, and transmitting mechanism connecting the rotary element and the said last-mentioned shaft, cams on said last-mentioned shaft, and levers operated by the cams and adapted to move the anvil vertically whilethe table is still, substantially as described.

17. A riveting machine, comprising a casing, a rotary element in the casing, a vertically movable plunger projecting through the casing and constructed to be reciprocated by the rotary element, an anvil below the hammer, a rivet supporting disk or table located between the hammer and the anvil, a shaft, mechanism connecting the rotary element with the said shaft, whereby they are operated in unison, means between the shaft and the table, whereby an intermittent partial rotary movement is imparted to the table, cams on said shaft, levers fulcrumed between their ends, rollers on the ends of said levers in the path of movement of the cams, and the free ends of said lever constructed to elevate the anvil when moved by the cams, substantially as described.

18. A rivet-ing machine, comprising a casing, a rotary element in the casing, a vertically movable plunger projecting through the casing and constructed to be reciprocated by the rot-ary element, an anvil below the hammer, a rivet supporting disk or table located between the hammer and the anvil, a shaft, mechanism connecting the rotary element with the said shaft, whereby they are operated in unison, means bet-Ween the shaft and the table, whereby an intermittent partial rotary movement is imparted to the table, cams on said shaft, levers fulcrumed between their ends, rollers on the ends of said levers in the path of movement of the cams, a spindle supporting the anvil, a bracket clampedat one end around the spindle, threaded rods on said bracket, bars secured to said rods and projecting under the lower end of the spindle, and the free ends of said levers engaging said bracket, whereby the movement of the levers causes the movement of the spindle and the anvil, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

CHARLES W. MEADOWCROFT, SR.

Witnesses:

R. H. KRENKEL, CHARLES E. Po'r'rs.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

